hey, thanks for your answers. i have actually seen this machine (the 10k one) work(otherwise i wouldn't even consider buying it) and the provider is safe and checked. so far it's passed my expectations. I understand and you are completely right about the "unknowns". It was very unclear to me why everybody would rather go for cold storage, and even with the data presented i have to say i still incline towards the miner.
well i hope you turn out to be right. you may well do. look for suchmoon's thread on multipool profitability and get yourself on leaserig - see my sig